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a60dc39c01
global_cwq is now nothing but a container for per-cpu standard
worker_pools. Declare the worker pools directly as
cpu/unbound_std_worker_pools[] and remove global_cwq.
* ____cacheline_aligned_in_smp moved from global_cwq to worker_pool.
This probably would have made sense even before this change as we
want each pool to be aligned.
* get_gcwq() is replaced with std_worker_pools() which returns the
pointer to the standard pool array for a given CPU.
* __alloc_workqueue_key() updated to use get_std_worker_pool() instead
of open-coding pool determination.
This is part of an effort to remove global_cwq and make worker_pool
the top level abstraction, which in turn will help implementing worker
pools with user-specified attributes.
v2: Joonsoo pointed out that it'd better to align struct worker_pool
rather than the array so that every pool is aligned.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Joonsoo Kim <js1304@gmail.com>
65 lines
2 KiB
C
65 lines
2 KiB
C
/*
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* kernel/workqueue_internal.h
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*
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* Workqueue internal header file. Only to be included by workqueue and
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* core kernel subsystems.
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*/
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#ifndef _KERNEL_WORKQUEUE_INTERNAL_H
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#define _KERNEL_WORKQUEUE_INTERNAL_H
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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struct worker_pool;
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/*
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* The poor guys doing the actual heavy lifting. All on-duty workers are
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* either serving the manager role, on idle list or on busy hash. For
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* details on the locking annotation (L, I, X...), refer to workqueue.c.
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*
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* Only to be used in workqueue and async.
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*/
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struct worker {
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/* on idle list while idle, on busy hash table while busy */
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union {
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struct list_head entry; /* L: while idle */
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struct hlist_node hentry; /* L: while busy */
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};
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struct work_struct *current_work; /* L: work being processed */
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work_func_t current_func; /* L: current_work's fn */
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struct cpu_workqueue_struct *current_cwq; /* L: current_work's cwq */
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struct list_head scheduled; /* L: scheduled works */
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struct task_struct *task; /* I: worker task */
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struct worker_pool *pool; /* I: the associated pool */
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/* 64 bytes boundary on 64bit, 32 on 32bit */
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unsigned long last_active; /* L: last active timestamp */
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unsigned int flags; /* X: flags */
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int id; /* I: worker id */
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/* for rebinding worker to CPU */
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struct work_struct rebind_work; /* L: for busy worker */
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/* used only by rescuers to point to the target workqueue */
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struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
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};
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/**
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* current_wq_worker - return struct worker if %current is a workqueue worker
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*/
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static inline struct worker *current_wq_worker(void)
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{
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if (current->flags & PF_WQ_WORKER)
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return kthread_data(current);
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return NULL;
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}
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/*
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* Scheduler hooks for concurrency managed workqueue. Only to be used from
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* sched.c and workqueue.c.
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*/
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void wq_worker_waking_up(struct task_struct *task, unsigned int cpu);
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struct task_struct *wq_worker_sleeping(struct task_struct *task,
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unsigned int cpu);
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#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
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